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Just built a new win2022 server, installed FZ server 1.6.4, copied configurations and users from FZ beta 0.9.x server.
TLS not yet configured, all clients connect via unsecure FTP.
passive mode using 49152-65534, firewall ports 21,22,989,990,49152-65534 are open.
FZ server is running not as system but as a user account, and that user account can perform all file operations on the disk/directory without any problem.
FZ user account has read+write, apply permissions, writable structure, create native if does not exist.
FZ user [using winscp] can upload, delete, without any problem but cannot rename files, receives 550 Permission denied on the server when RNFR is attempted.
Thanks in advance

Need to investigate the RNFR issue.

An observation about ports in the meantime, assuming default configuration, this obviously doesn't hold for highly unusual custom setups:
There is no need to forward port 22 which is reserved SFTP, not supported by the free FileZilla Server.
There is no need to forward port 989, not used for anything.
If TLS is not configured, there is no need to forwards port 990, which is reserved for implicit FTP over TLS (FTPS). Since implicit FTPS has never been formally specified, it's best to just stick with just port 21 for both plain and explicit FTP over TLS.

Fixed in 1.6.5, sorry for the inconvenience.

Confirmed fixed, thank you. Also thank you for the port advice.